Scientists Plan 'Deep Impact' Crash With Comet
Planning for the Deep Impact mission began in 1999. It culminates on July 4, 2005, when a “fly-by” spacecraft will release a smaller “impactor” spacecraft, which will smash into comet Tempel 1 at 37,000 kilometers (22,000 miles) per hour…. The impact is expected to create a crater 100 meters in diameter and up to 30…